Doubled output of text nodes

I have an application which produces XML docs similar to this one:
---------------------------------------------------------
<?xml version="1.0"?>
<root>
  <node>
    <node>Topic A
      <node>Subtopic A.1
        <node>Subtopic A.1.a</node>
      </node>
    </node>
    <node>Topic B</node>
  </node>
</root>
---------------------------------------------------------
I wish to use XLT to add unique id's to each node element, but otherwise
copy the content unchanged to the output. I have worked out this XSLT:
---------------------------------------------------------
<?xml version="1.0" ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml" indent="yes" encoding="UTF-8" />
  <xsl:template match="/">
    <xsl:apply-templates />
  </xsl:template>
  <xsl:template match="node">
    <xsl:variable name="id">
      <xsl:value-of select="generate-id()" />
    </xsl:variable>
    <node id="{$id}"><xsl:value-of select="text()[position()=1]" />
      <xsl:apply-templates />
    </node>
  </xsl:template>
  <xsl:template match="root">
    <xsl:variable name="id">
      <xsl:value-of select="generate-id()" />
    </xsl:variable>
  <root id="{$id}">
    <xsl:apply-templates />
  </root>
  </xsl:template>
</xsl:stylesheet>
---------------------------------------------------------
The output produces two copies of the desired text nodes:
---------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<root id="N400001">
  <node id="N400004">
		
    <node id="N400006">Topic A
      Topic A
      <node id="N400008">Subtopic A.1
        Subtopic A.1
        <node id="N40000A">Subtopic A.1.aSubtopic A.1.a</node>
      </node>
    </node>
    <node id="N40000F">Topic BTopic B</node>
  </node>
</root>
---------------------------------------------------------
I imagine that my problem is in the XPath expression, but I haven't been
able to see how I might express it differently.

Any suggestions?

Thanks.
-- 
Charles Knell
cknell@xxxxxxxxxx - email
 

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